Rotary pump



Aug. 21, 1962 M. KARL ETAL 3,050,011

ROTARY PUMP Filed May 20, 1959 FIG.

o 0 0 o /s- F I G. 3 INVENTORS 24' MARTIN KARL WALTER REXROTH /4- BY F IG. 2

ATT EY iinited grates 3,050,011 ROTARY PUNIP Martin Karl, 48 Reed St.,Pontiac, R.I., and Walter Rexroth, New London Turnpike, West Warwick,RI. Filed May 20, 1959, Ser. No. 814,490 4 Claims. (Cl. 103126) Ourpresent invention relates to pumps, and more particularly to a novelconstruction of a rotary pressure pump.

The principal object of the present invention is to provide a rotarypressure pump which will deliver a given quantity of liquid with lesshorsepower than that required by conventional pumps.

A further object of the present invention is to provide a rotarypressure pump which will deliver a given quantity of liquid with asmaller size pump than that required by conventional pumps.

Another object of the present invention is to provide a rotary pressurepump having a minimum number of moving parts.

With the above and other objects and advantageous features in view, ourinvention consists of a novel arrangement of parts, more fully disclosedin the detailed description following, in conjunction with theaccompanying drawings, and more particularly defined in the appendedclaims.

In the drawings,

FIG. 1 is an enlarged section taken on line 1-1 on FIG. 2.

FIG. 2 is a top plan view of the pump with the cover removed.

FIG. 3 is a view similar to FIG. 2 with the blades turned ninetydegrees.

In various types of pumping operations, liquid or chemicals must becirculated in large quantities and often in both directions. Gear pumps,normally used for this purpose are inefficient and wear quickly whenoperated at high speeds. The present invention provides a rotarypressure pump utilizing impellers in the place of gears to eliminatewear. Furthermore, the pump of the present invention is designed tocirculate large quantities of liquid with a minimum of power.

Referring more in detail to the drawings, the pump of the presentinvention comprises a generally rectangular housing having an end wall11 and side walls 12 integrally therewith. The housin is provided withsolid corners 13 to form a generally oval pump cavity 14. The other endwall 15 comprises a removable cover which is retained on the end walls12 by a plurality of bolts 16 and sealed with a gasket 17. A pair ofspaced parallel shafts 18 and 19 extend through the end wall 11, throughthe pump cavity 14 and are journaled in bearings 2t) and 21 respectivelyin the cover portion 15.

Mounted on a shaft 18 in the cavity 14- is an impeller blade 22. Mountedon the shaft 19 is a complementary impeller blade 23 identical with theblade 22. The impeller blades 22 and 23 are provided with oppositecurved edges 24 comprising segments of circles and terminating in acurved blade edge 25 which forms a complete circle when the impellerblades are clearing each other as shown in FIG. 2. The impeller bladesrotate in opposite directions and are designed to barely touch in theposition shown in FIG. 2 and to be separated to allow free passage ofliquid therebetween in the position shown in FIG. 3. The inlet openings26 are in the end walls 12 on opposite sides between the impellerblades.

The pump of the present invention is reversible. Experience has shownthat where ordinary bearings are provided, the strain of reversing thedirection of rotation 3,5,ll Patented Aug. 21, 1962 frequently dislodgesthe bearings. It is therefore preferred that the bearings be mounted asshown in FIG. 1. Each shaft 18 and 19 passes through a bearing 27 havingpermanent type lubricated packing 28. The bearings 27 are provided withexternal flanges 29. A plurality of bolts 30 extend through the flanges29 and into the end wall 11 to lock the bearing in place and preventtwisting movement of the bearing. Externally of the pump housing, theshafts 13 and 19 are provided with meshing gears 31 so that if the shaft18 is driven in one direction the shaft 19 will be driven in theopposite direction at the same speed. The gears 31 are timing gears andmay be adjusted to set the initial position of the impellers withrespect to each other.

The applicants have found that the above construction permits thedelivery of large quantities of liquid with about one-half of thehorsepower required by other types of pumps and with only half the sizeof conventional gear pumps. The pump of the present invention will pumpor circulate any chemical and will easily pump sludge or muddy water.Where the water is being pumped from a tank or reservoir positionedabove the pump, the blades are set as shown in FIGS. 2 and 3. In theposition shown in FIG. 3, when no pressure is being applied, the watercan flow freely through the pump by gravity. This permits rapidcirculation of large quantities of Water. When the pump must applypressures at all times the impellers are first positioned at rightangles to each other so that there is never any opening between theimpellers in any position to permit the back pressure through the pump.

Since there are no meshing gears, wear is reduced to a minimum and thepump will operate efficiently over long periods of time. The pump can behoused in an external housing so that the gears 31 can operate in greaseat all times. This will provide quiet operation and long life. Otheradvantages of the present invention will be readily apparent to a personskilled in the art.

We claim:

1. A reversible circulating pump comprising a housing having side wallsand one end wall, a cover for the other end of said housing, saidhousing having an oval cavity, a pair of spaced parallel shaftsextending through said end wall and cavity and into said cover, animpeller mounted in said cavity on each shaft, an inlet and outletopening in opposite side wall portions of said housing between saidshafts, and intermeshing timing gears on said shafts outside of saidhousing, said impellers being identical, each having a general S-shapewith thick central portions tapering to a curved point at each end, saidshafts extending through the center of said central portions, the axesof the said impellers being so spaced that the respective ends intermeshbut so positioned that one end of one will clear the end of the otherwhen they are rotated in opposite directions, the inside curve of eachblade end forming a circle with the inside curve of the blade of theintermeshing impeller, the thickness and curvature of said impellersbeing so shaped that they sealingly contact each other at all timesduring rotation when said impellers are initially positioned at rightangles to each other.

2. A reversible circulating pump comprising a housing having side wallsand one end wall, a cover for the other end of said housing, saidhousing having an oval cavity, a pair of spaced parallel shaftsextending through said end wall and cavity and into said cover, animpeller mounted in said cavity on each shaft, an inlet and outletopening in opposite side wall portions of said housing between saidshafts, and intermeshing timing gears on said shafts outside of saidhousing, said cover and end wall having bearings for said shafts, saidend wall bearings each including a T-shaped bearing having bolts passingthrough the cross portion for anchoring said bearings to said end wall,said impellers being identical, each having a general S-shape with thickcentral portions tapering to a curved point at each end, said shafts extending through the center of said central portions, the axes of thesaid impellers being so spaced that the respective ends intermesh but sopositioned that one end of one will clear the end of the oher when theyare rotated in opposite directions, the inside curve of each blade endforming a circle with the inside curve of the blade of the intermeshingimpeller, the thickness and curvature of said impellers being so shapedthat they sealingly contact each other at all times during rotation whensaid impellers are initially positioned at right angles to each other.

3. A reversible circulating pump comprising a housing having side wallsand one end wall, a cover for the other end of said housing, saidhousing having an oval cavity, a pair of spaced parallel shaftsextending through said end wall and cavity and into said cover, animpeller mounted in said cavity on each shaft, an inlet and outletopening in opposite side wall portions of said housing between saidshafts, and intermeshing timing gears on said shafts outside of saidhousing, said impellers being identical, each having a general S-shapewith thick central portions tapering to a curved point at each end, saidshafts extending through the center of said central portions, the axesof the said impellers being so spaced that the respective ends intermeshbut so positioned that one end of one will clear the end of the otherwhen they are rotated in opposite directions, the inside curve of eachblade end forming a circle with the inside curve of the blade of theintermeshing impeller, the thickness and curvature of said impellersbeing so shaped that they sealingly contact each other at all timesduring rotation when said impellers are initially positioned at rightangles to each other, said timing gears permitting changes in therelative position of said impellers to provide for a space more thansealing clearance between said impellers at all times during therotation of said impellers when they are initially placed in parallelposition.

4. A reversible circulating pump comprising a housing having side wallsand one end wall, a cover for the other end of said housing, saidhousing having an oval cavity, a pair of spaced parallel shaftsextending through said end wall and cavity and into said cover, animpeller mounted in said cavity on each shaft, an inlet and outletopening in opposite'side wall portions of said housing between saidshafts, and intermeshing timing gears on said shafts outside of saidhousing, said cover and end wall having bearings for said shafts, saidend wall bearings each including a T-shaped bearing having bolts passingthrough the cross portion for anchoring said hearings to said end wall,said impellers being identical, each having a general S-shape with thickcentral portions tapering to a curved point at each end, said shaftsextending through the center of said central portions, the axes of thesaid impellers being so spaced that the respective ends intermesh but sopositioned that one end of one will clear the end of the other when theyare rotated in opposite directions, the inside curve of each blade endforming a circle with the inside curve of the blade of the 'intermeshingimpellers, the thickness and curvature of said impellers being so shapedthat they sealingly contact'each other at all times during rotation whensaid impellers are initially positioned at right angles to each other,said timing gears permitting changes in the relative position of saidimpellers to provide for a space more than sealing clearance betweensaid impellers at all times during the rotation of said impellers whenthey are initially placed in parallel position.

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